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SHORT-TERM AND LONG-TERM DEBT - Components (Details) - USD ($) | Dec. 31, 2023 | Mar. 31, 2023 | Feb. 28, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total debt | $ 1,826,504,000 |  |  | $ 1,732,679,000
Current portion of debt | (106,135,000) |  |  | (99,706,000)
Long-term portion of debt issuance costs | (12,096,000) |  |  | (13,749,000)
Long-term debt | 1,708,273,000 |  |  | 1,619,224,000
U.S. dollar denominated floating rate debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt | 1,280,623,000 |  |  | 1,329,878,000
U.S. dollar denominated floating rate debt | Flex Amber Sale and Leaseback |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt | 0 |  |  | 139,022,000
U.S. dollar denominated floating rate debt | $320 Million Sale and Leaseback |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Gross price | 320,000,000 |  |  |
Total debt | 287,275,000 |  |  | 305,974,000
U.S. dollar denominated floating rate debt | $330 Million Sale and Leaseback |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Gross price | 330,000,000 |  | $ 330,000,000 |
Total debt | 313,000,000 |  |  | 0
U.S. dollar denominated floating rate debt | Flex Rainbow $180 Million Sale and Leaseback |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Gross price |  | $ 180,000,000 |  |
Total debt | 174,066,000 |  |  | 0
U.S. dollar denominated fixed rate debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt | 145,881,000 |  |  | 152,801,000
U.S. dollar denominated fixed rate debt | Flex Volunteer Sale and Leaseback |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt | 145,881,000 |  |  | 152,801,000
U.S. dollar denominated revolving credit facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt | 400,000,000 |  |  | 250,000,000
$629 Million Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  | 629,000,000 | $ 629,000,000 |
$629 Million Facility | U.S. dollar denominated floating rate debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | 629,000,000 |  |  |
Total debt | 0 |  |  | 467,865,000
$125 million term tranche under the $375 Million Facility | U.S. dollar denominated floating rate debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  |  |  | 125,000,000
Total debt | 97,354,000 |  |  | 119,475,000
$375 million revolving credit facility | U.S. dollar denominated revolving credit facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | 375,000,000 |  |  |
Flex Enterprise $150 Million Facility | U.S. dollar denominated floating rate debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | 150,000,000 |  |  |
Total debt | 137,718,000 |  |  | 147,542,000
Flex Resolute $150 Million Facility | U.S. dollar denominated floating rate debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | 150,000,000 |  |  |
Total debt | 142,106,000 |  |  | 150,000,000
$140 million term tranche under the $290 Million Facility | U.S. dollar denominated floating rate debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  | 140,000,000 |  |
Total debt | 129,104,000 |  |  | 0
$290 million facility | U.S. dollar denominated revolving credit facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | 290,000,000 | 290,000,000 |  |
$250 million revolving tranche under the $375 Million Facility | U.S. dollar denominated revolving credit facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  |  |  | 250,000,000
Total debt | 250,000,000 |  |  | 250,000,000
$150 million revolving tranche under the $290 Million Facility | U.S. dollar denominated revolving credit facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  | $ 150,000,000 |  |
Total debt | $ 150,000,000 |  |  | $ 0

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